Pressure loads

[Dean Romig]

I stand corrected - thank you Edgar. I had a gut feeling you would come on and do that. So thank you for ‘simplifying’ it all for us.
Your background in metals production, forging, etc. and your training and experience in metalurgy qualifies you to do so... so again Thank You. I used the wrong term. You used the right term and backed it up with data.

I guess my response to Mr. Rivers was meant to direct him away from any assumptions he may have been making about 75,000 lbs having anything to do with reasonable (sane) loads we should be using in these old guns.





.

[Drew Hause]

Here you go
Barrel Steel Strength & Composition
https://docs.google.com/document/d/1...EK8OtPYVA/edit
A pre-WWI Titanic steel barrel was AISI 1030 with an industrial standard tensile strength (which is NOT bursting pressure) of about 75,000; which was similar to most pre-WWI Belgian sources fluid steel tubes used by U.S. makers

Turn-of-the-Century Shotshells, Powder, Proof & Ballistics
https://docs.google.com/document/d/1...UOZEFU/preview

Scroll down about 1/4 for an explanation of Parker Bros. proof testing

The 1893 Parker Bros Catalogue documented proof testing with Smokeless Powder in house
"Our guns are bored on the latest improved system for shooting Nitros, or Smokeless Powder, and all our guns are tested with some one of the most approved makes, and a tag accompanies each gun, giving the results of such a (pattern) test."

A Parker Service and Proof Load table was published in the 1930s and reproduced in the The Parker Story p. 515.
12g 2 3/4” shell Service Pressure is 10,500 psi. Definitive proof used 7.53 Drams Black Powder and 2 oz. shot with a pressure of 15,900 psi. The pressure was no doubt measured using LUP and modern transducer values would be 10-14% higher, or more than 17,500 psi.

LTC Calvin Goddard reported the same numbers in “Army Ordnance”, 1934. He wrote that Parker followed the SAAMI standards of that period: 13,700 psi proof, 9500 psi service for 2 5/8” chamber; 15,900 psi proof, 10,500 psi service for 2 3/4” chamber (by LUP) + 10-14% for modern transducer measurement.

[Michael rivers]

Originally Posted by Drew Hause

Here you go
Barrel Steel Strength & Composition
https://docs.google.com/document/d/1...EK8OtPYVA/edit
A pre-WWI Titanic steel barrel was AISI 1030 with an industrial standard tensile strength (which is NOT bursting pressure) of about 75,000; which was similar to most pre-WWI Belgian sources fluid steel tubes used by U.S. makers

Turn-of-the-Century Shotshells, Powder, Proof & Ballistics
https://docs.google.com/document/d/1...UOZEFU/preview

Scroll down about 1/4 for an explanation of Parker Bros. proof testing



The 1893 Parker Bros Catalogue documented proof testing with Smokeless Powder in house
"Our guns are bored on the latest improved system for shooting Nitros, or Smokeless Powder, and all our guns are tested with some one of the most approved makes, and a tag accompanies each gun, giving the results of such a (pattern) test."

A Parker Service and Proof Load table was published in the 1930s and reproduced in the The Parker Story p. 515.
12g 2 3/4” shell Service Pressure is 10,500 psi. Definitive proof used 7.53 Drams Black Powder and 2 oz. shot with a pressure of 15,900 psi. The pressure was no doubt measured using LUP and modern transducer values would be 10-14% higher, or more than 17,500 psi.

LTC Calvin Goddard reported the same numbers in “Army Ordnance”, 1934. He wrote that Parker followed the SAAMI standards of that period: 13,700 psi proof, 9500 psi service for 2 5/8” chamber; 15,900 psi proof, 10,500 psi service for 2 3/4” chamber (by LUP) + 10-14% for modern transducer measurement.

Great! Thanks so much for that info. I just need to know facts instead of assumptions.

[Michael rivers]

There’s no argument here all I need to know is what test did Parker’s bro’s do on there barrels
So no ones right or wrong I’m asking for data that Parker bro’s held.